同濟(jì)大學(xué)通信系統(tǒng)原理英文班練習(xí)題附答案

1、Chapter1Homewk:FillinQuestions:1.InaMarycommunicationsystemeachsymbolcontains()bits2logMinfmationcontent.2.Thepurposeofcommunicationisto(transferinfmation).Efficiencyofthedigitalcommunicationsystemcanbemeasuredbythespeci

2、ficationssuchas()()().reliabilitycanbemeasuredby()().3.Thebasicfactsfmeasuringthemeritofacommunicationsystemare(efficiency)(reliability).4.Themaininfluenceofconstantparameterchannelonsignaltransmissionareusuallydescribed

3、bytheir(AmplitudeFrequency)(PhaseFrequency)acteristics.5.Commonacteristicsofromparameterchannelsare(transmissionattenuationofthesignalisvaryingwithtime)(transmissiondelayofthesignalvarieswithtime)(signalarrivesattherecei

4、veroverseveralpaths).MultipleChoiceQuestions:1.Fanalogdigitalcommunicationswhichis(are)true(ABCD).A.digitalcommunicationtypicallyusesmebwidth.B.analogcommunicationcaresmeaboutfidelityC.digitalcommunicationcaresmeaboutpro

5、babilityfcrectdecisionD.digitalcommunicationtypicallyusesanalogcarriertocarrybasebsignalsChapter2Homewk:2.12.42.52.62.82.11FillinQuestions:1.AWGNnoiseisshttermf(AdditiveWhiteGaussianNoise).2.Thepowerspectraldensity(theau

6、tocrelationfunction)ofastationaryromprocessareapairofFouriertransfm.3.Ifbwidthis10MHzsignaltonoiseratiois20dBtheShannoncapacityisC=(66.6Mbps).SingleChoiceQuestions:1.Assumeisageneralizedstationaryromprocesswithzeromathem

7、atical()expectationthentheaveragepowerofis(D).()A.B.C.D.[()]2[()](∞)[()]2.Fanarrowbromprocessifisa00()()cos()sinCSXtXttXtt????()XtGaussianprocessthen(A).(A)arealsoGaussianprocesses(B)OnlyisalsoGaussianprocess()CXt()SXt()